Toyota 4.0 Secondary air Pump Fix, Hewitt Gen 2 Bypass, Save Thousands

My 5th gen 4runner had been having a recurring problem going into limp mode soon after start up. I could clear the codes and it would then run fine. While I had the truck in for and oil change and alignment I went ahead and let them run the codes. I had multiple codes for the secondary air injection system (SAIS). My valves were stuck closed and the fix was quoted as a $2,000 repair for parts and labor. WOW. Intent to just fix it myself I went to pick my runner up and the service manager told me about the bypass. He used the Hewitt bypass on his Tundra and he explained it was quick and much cheaper than the OEM replacement. So, I went to Hewitt Technologies and purchased their gen 2 unit for my 4runner. It is quick and only took about 30 minutes or so to install. I encountered a little problem when starting my truck up after the install and it took me a few days to get it just right. I called Hewitt and worked through my issues and determined it had to be something simple or my valves were bad (which would have required a Pressure switch option). However, I have a relay that I use for a switched ground that gets its power from an add a circuit from the under hood fuse box, which just happens to be the fuel injector fuse. With the vehicle now happy and starting and running right it took a few minutes for the computer to sync with the bypass and all is currently good. Their customer service is as good as their product.

#toyota #4runner #DIY